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Cubs vs. Milwaukee Brewers at Miller ParkTV: WGN Monday and Thursday; Comcast SportsNet Plus Tuesday; Comcast SportsNet WednesdayRadio: WGN 720-AMPitching matchups: The Cubs' Edwin Jackson (8-15) vs. Wily Peralta (9-15) Monday at 7:10 p.m.; Jeff Samardzija (8-12) vs. Marco Estrada (6-4) Tuesday at 7:10 p.m.; Chris Rusin (2-4) vs. Tyler Thornburg (2-1) Wednesday at 7:10 p.m.; Jake Arrieta (2-2) vs. Kyle Lohse (10-9) Thursday at 1:10 p.m.At a glance: The Brewers took two of three from the Cubs at Wrigley Field earlier this month. Jean Segura led the Brewers in batting average (.298) and hits (170) entering Sunday's game with the Reds. Carlos Gomez led in homers (19), and Jonathan Lucroy topped the Brewers in RBI (77). Milwaukee ranked ninth in the National League in runs, sixth in homers and 10th in on-base percentage heading into Sunday. The Cubs were 12th in runs, second in homers and 14th in OBP. Samardzija has 1942⁄3 innings pitched as he closes in on 200 for the first time in his career.Next: Atlanta Braves at Wrigley Field, Friday-Sunday -- Bruce Miles

It's Javier Baez's ascension and Ian Stewart's flameout. It's the Daytona pitching staff's incredible postseason run and Jorge Soler's leg injury. It's the Cubs' excellent offensive production out of third base and right field, and the subpar offensive seasons of Starlin Castro and Darwin Barney in the middle of the infield. It's Kevin's Gregg's bullpen-saving performance in the 9th inning and Kyuji Fujikawa's reconstructed elbow.

I could go on and on, but you get the point.

The big picture talk is probably best centered around the 25-and-under crowd in the organization, comprised mainly of minor league players at the moment.

The two big leaguers under that age limit are the guys we have analyzed and dissected ad nauseam at every turn this summer: Starlin Castro and Anthony Rizzo. And collectively, they have given us a mixed bag at best this season.

I think 2014 will give us more answers in terms of how Rizzo adjusts following his first full season in the big leagues and how Castro responds after the first prolonged slump of his life.

But the biggest positive developments of 2013 on the current roster are the seasons Travis Wood and Welington Castillo have put together.

They're both 26 and while they aren't often lumped in with Castro and Rizzo, it's about time we put them in that future core.

Wood was the Cubs' lone All-Star this season, should easily surpass 200 innings, has a shot at a sub-3.00 ERA, has beaten Clayton Kershaw on the road, and recently had his manager call him the team's No. 1 starter.

Castillo has had an under-the-radar Gold Glove-caliber year behind the plate. He won't win it because veterans Yadier Molina and Russell Martin get way more publicity, and his error total is too high. His pitch-blocking prowess and control of the running game have been terrific, however. Look at any catching defensive metrics on FanGraphs.com or Baseball-Reference.com and you will see his name among the leaders behind the plate.

Added to that, we have seen tangible offensive improvement from Castillo this season. Among all Cubs with at least 300 at-bats, he leads the team in on-base percentage, which is amazing considering he took one walk in his first 36 games this season. And there's some power in that bat that has emerged at times this season. If it can show up a little more often, you've got an all-star caliber catcher on your hands.

The entire organizational process the last two years has been about moving veterans, bringing in high-ceiling minor league talent in return, and determining which big league players will be a part of the core moving forward.

Castro and Rizzo happened to be the first two players pegged to help lead the way. And there is absolutely going to be pressure on both to step up next season and play to the potential everyone around them sees.

But while their inconsistent seasons have grabbed most of the headlines, let's not forget that an athletic, unflappable left-hander and a quiet, hardworking backstop have forced their way squarely into the big picture conversation.

Oh, and if you're wondering where Junior Lake and Chris Rusin stand, the door is wide open for both if they can carry over this year's success to 2014 as well.

• Len Kasper is the TV play-by-play broadcaster for the Chicago Cubs. Follow him on Twitter @LenKasper and check out his [URL]blog entries;http://wgntv.com/news/stories/len-and-jds-cubs-baseball-blog/[URL] with Jim Deshaies at wgntv.com. To post comments or questions for Len, click on the comment link with his column at dailyherald.com.[/URL]

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